How far over the limit can I go

As I've posted in other threads, I own a PrimaLuna integrated amp that senses when a power tube is about to fail, puts the amp in safe mode - - and tells you which power tube is the culprit.  In several years of ownership that feature has kicked in twice - potentially saving me a lot of grief and money.

Questions for the group - are there any other tube amp manufacturers that offer a similar feature? If not, why not?  I don't pretend to understand how the "bad tube indicator" circuit in the PrimaLuna works - - or the costs involved.  But it has proven its worth to me, and I rest a bit easier knowing it actually works.

Go ahead and order a set of tubes. You're going to need them soon, so why wait? This way you'll have them on hand when the old ones start to go and you'll experience no down time. You will know when it's time to make the change, your SQ will change for the worse.

I used to have a set of Manley Neoclassic 250s. Turned it on with an old set of tubes one day and BAM! Power tube went down swinging and took out a resistor. Luckily Manley sold these clip on replacements so I was able to get them replaced myself. Always a risk with old tubes. 

IF/When you decide to try and keep tube gear: Buy a simple tube tester!!!!!

Give yourself the easy confidence of knowing simple: short, no short, good, bad, how strong, matched tubes similar strength.

I have a big fancy one gathering dust because my simple portable one and the big one always agree.

https://www.ebay.com/itm/124523483585?hash=item1cfe2d91c1:g:6hYAAOSwKm9f~K3J

some tubes can not be tested on older units, check for that.

btw, what do you mean 2,000. hours. What tubes? Many, many tubes last 10,000. hours